To ravage always wrong, note (3,5)
I believe the answer is:
lay waste
'to ravage' is the definition.
(thesaurus)
'always wrong note' is the wordplay.
'wrong' indicates an anagram.
'note' becomes 'te' (**).
'always' with letters rearranged gives 'laywas'.
'laywas'+'te'='LAY WASTE'
(Other definitions for lay waste that I've seen before include "Destroy or ruin, demolish" , "Destroy, raze to the ground" , "wreak devastation" , "Raze, destroy buildings, crops etc" , "Make desolate" .)